CN204190978U - A kind of controllable silicon maintains current compensation circuit - Google Patents
A kind of controllable silicon maintains current compensation circuit Download PDFInfo
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- CN204190978U CN204190978U CN201420541550.XU CN201420541550U CN204190978U CN 204190978 U CN204190978 U CN 204190978U CN 201420541550 U CN201420541550 U CN 201420541550U CN 204190978 U CN204190978 U CN 204190978U
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 51
- 239000010703 silicon Substances 0.000 title claims abstract description 51
- 238000005070 sampling Methods 0.000 claims description 80
- 239000004065 semiconductor Substances 0.000 claims description 16
- 230000000052 comparative effect Effects 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 14
- 230000003750 conditioning effect Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000009514 concussion Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 210000003205 muscle Anatomy 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The utility model provides a kind of controllable silicon and maintains current compensation circuit, by to sample to the output voltage of on state current or rectification circuit and differential process obtains differential signal, when the rate of change of the rate of change of on state current or the output voltage of rectification circuit is larger, a corresponding large offset current is produced according to differential signal, when the rate of change of the rate of change of on state current or the output voltage of rectification circuit is less, compensate a corresponding little offset current at this moment, load current and offset current sum is made to be greater than maintenance electric current, thus avoid the improper shutoff of controllable silicon.Impulse when the utility model considers controlled silicon conducting and shake the situation of the maintenance curent change caused, and according to impulse and the size of shaking dynamic conditioning offset current, so this circuit solves the problem that LED is dodged when on state current exists and impacts and shake, and improve the service efficiency of compensating circuit.
Description
Technical field
The utility model relates to circuit engineering field, particularly relates to a kind of controllable silicon and maintains current compensation circuit.
Background technology
At present, utilizing controllable silicon to carry out LED light modulation is one of common LED light regulating technology, be illustrated in figure 1 silicon controlled light adjusting circuit, comprise: controllable silicon dimmer 100, rectification circuit 200, DC/DC change-over circuit 300, LED load 400 and AC power 600, Output Voltage in Rectified Circuits is V1, output current is I1, and the on state current electric current I 0 in circuit equals load current I1.Fig. 2 is the curve synoptic diagram of the on state current of above-mentioned silicon controlled light adjusting circuit.
Controllable silicon has one to maintain electric current, and when on state current is less than silicon controlled electric current, controllable silicon just can turn off and cause LED to glimmer.And in the controllable silicon LED light adjusting system of reality, because LED load and DC/DC change-over circuit are capacitive load, so controlled silicon conducting can produce impulse current instantaneously, exist within t1 ~ t1 ' time period as shown in Figure 3 and impact and vibration.And electric current in controllable silicon is relevant with the rate of change of on state current.
Therefore a kind of compensating circuit of present needs, not only can solve controllable silicon and turn off problem in the mistake of zero crossing, also can solve the problem that the controllable silicon when on state current exists impact and shakes turns off the LED sudden strain of a muscle caused by mistake, and improve the service efficiency of compensating circuit.
Utility model content
The utility model provides a kind of controllable silicon and maintains current compensation circuit, solve controllable silicon and turn off problem in the mistake of zero crossing, also solve the controllable silicon when on state current exists impact and concussion and turn off the problem of the LED sudden strain of a muscle caused by mistake, namely solve the problem that in the whole cycle, controllable silicon turns off by mistake, and improve the service efficiency of compensating circuit.
For solving the problems of the technologies described above, a kind of controllable silicon that the utility model provides maintains current compensation circuit, and comprise AC power, controllable silicon dimmer, the rectification circuit be connected with capacitive load, is characterized in that, also comprises:
Sampling is carried out and differential to the output voltage of described rectification circuit or electric current, and the differential signal obtained is exported to the sampling differential circuit of current compensation circuit;
Be connected with sampling differential circuit, according to the described current compensation circuit of described differential signal with the electric current and a reference signal generation offset current that flow through described capacitive load.
Preferably, described sampling differential circuit comprises:
The output voltage of described rectification circuit is sampled, and the voltage sample differential circuit that differential obtains voltage derivative signal is carried out to described output voltage; Or,
The output current of described rectification circuit is sampled, and the current sample differential circuit that differential obtains current differential signal is carried out to described output current.
Preferably, described current compensation circuit comprises:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit comprises comparator;
The first input end of described comparator to be connected with described sampling differential circuit through the 5th resistance and to receive described differential signal, described first input end through the 4th resistance to be connected with described load current sampling resistor receive load current change after load voltage, second input of described comparator is connected with described reference signal, described differential signal through the 5th resistance with the described load current sampling resistor acting in conjunction through described 4th resistance at the first input end of described comparison circuit, described first input end is the sampling end of described comparison circuit; Described comparator compares described load voltage and described differential signal with value and described reference signal, and exports comparative result;
An input of described feedback circuit is connected with the output of described comparator, the output of described feedback circuit is connected with the first input end of described comparator with described 4th resistance through described load current sampling resistor, the output head grounding of described feedback circuit, another input of described feedback circuit is connected with the input of capacitive load, described feedback circuit exports offset current according to the described comparative result received, and described offset current and described load current be converted to described load voltage with value, input to the first input end of described comparator.
Preferably, described current compensation circuit comprises:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit comprises comparator;
The first input end of described comparator to be connected with described sampling differential circuit through the 6th resistance and to receive described differential signal, described differential signal is through the 6th resistance and the described reference signal acting in conjunction first input end at described comparator, and described first input end is the reference edge of described comparator; Described comparator second input is connected with one end of described load current sampling resistor, for receiving the load voltage after the conversion of described load current, described comparator compares described differential signal and reference signal with value and described load voltage, and export comparative result, the other end ground connection of described load current sampling resistor;
An input of described feedback circuit is connected with the output of described comparator, and described feedback circuit output is connected with the first input end of described comparator, and another input of described feedback circuit is connected with the input of capacitive load; Described feedback circuit exports offset current according to the described comparative result received, and described offset current and described load current be converted to described load voltage with value, inputs to the second input of comparator.
Preferably, described voltage sample differential circuit comprises:
The first electric capacity be connected with described rectification circuit output end;
The first resistance be connected with described first electric capacity, with the second electric capacity of described first resistor coupled in parallel, the other end ground connection of described first resistance;
Described first electric capacity is connected with described current compensation circuit with the points of common connection of described first resistance.
Preferably, described current sample differential circuit comprises:
Be series at and described capacitive load between sampling resistor;
First electric capacity in parallel with described sampling resistor;
Described first electric capacity is connected with described current compensation circuit with the points of common connection of described sampling resistor.
Preferably, also comprise:
NPN type triode and filter capacitor;
Described first electric capacity is connected with the base stage of described triode with the points of common connection of described first resistance;
The collector electrode of described triode is connected with positive source;
The emitter of described triode is connected to the ground by emitter resistance;
Described filter capacitor is in parallel with described emitter resistance.
Preferably, also comprise:
Diode, described Diode series is between rectification bridge output end and described first electric capacity; The anode of described diode connects rectification bridge output end, and negative electrode connects the first electric capacity; Or,
Described Diode series is between described sampling resistor and described first electric capacity; The anode of described diode connects described sampling resistor, and negative electrode connects the first electric capacity.
Preferably, described feedback circuit comprises N-type metal-oxide-semiconductor;
The grid of described N-type metal-oxide-semiconductor is connected with the output of described comparator;
The drain electrode of described N-type metal-oxide-semiconductor is connected with described capacitive load input;
When described comparator is used for the comparing with value and described reference signal of described load voltage and described differential signal, the source electrode of described N-type metal-oxide-semiconductor is connected with one end of described load current sampling resistor ground connection;
When described comparator is used for the comparing with value and described load voltage of described differential signal and described reference signal, one end that source electrode and the described load current sampling resistor of described N-type metal-oxide-semiconductor connect described comparator second input is connected.
Preferably, described capacitive load comprises: LED driver, the filter capacitor in parallel with described LED driver input, the LED light source in parallel with described LED driver output.
Preferably, described current compensation circuit comprises an integrated circuit and load current sampling resistor;
Described integrated circuit comprises described comparison circuit and described feedback circuit.
The utility model provides a kind of controllable silicon and maintains current compensation circuit, relevant with the size maintaining electric current by the rate of change of the known on state current of background technology, in addition on state current is loop current, loop current is consistent with the amplitude variation tendency of voltage after rectifier bridge, so the rate of change of voltage is all proportional with maintenance electric current after the rate of change of on state current and rectifier bridge.The utility model carries out sampling by the voltage exported on state current or rectification circuit and differential obtains corresponding differential signal.
When the rate of change of the rate of change of on state current or the output voltage of rectification circuit is larger, namely electric current is maintained when differential signal is larger also larger, now just produce a corresponding large offset current according to differential signal, when the rate of change of the rate of change of on state current or the output voltage of rectification circuit is less, namely electric current is maintained when differential signal is less also less, compensate a corresponding little offset current at this moment, load current and offset current sum to be made in a word to be greater than maintenance electric current, thus to avoid controllable silicon to turn off.
Impulse when the utility model considers controlled silicon conducting relative to prior art and shake the situation of the maintenance curent change caused, and according to impulse and the size of shaking dynamic conditioning offset current, instead of the offset current that compensation one is larger, so this circuit solves the problem that LED is dodged when on state current exists and impacts and shake, and improve the service efficiency of compensating circuit.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is existing controllable silicon light modulation current compensation circuit structure chart;
The curve synoptic diagram of Fig. 2 on state current disclosed in the utility model embodiment;
The curve synoptic diagram of Fig. 3 maintenance electric current disclosed in the utility model embodiment;
Fig. 4 a kind of controllable silicon disclosed in the utility model embodiment maintains the structural representation of current compensation circuit;
Fig. 5 is the structural representation that the utility model embodiment another controllable silicon disclosed maintains current compensation circuit;
Fig. 6 a kind of controllable silicon disclosed in the utility model embodiment maintains the structural representation of current compensation circuit;
Fig. 7 is the structural representation that the utility model embodiment another controllable silicon disclosed maintains current compensation circuit;
Fig. 8 is the curve synoptic diagram of the disclosed differential signal obtained after the process of over-sampling differential circuit of the utility model embodiment;
Fig. 9 is the structural representation that the utility model embodiment another controllable silicon disclosed maintains current compensation circuit;
Figure 10 a kind of controllable silicon disclosed in the utility model embodiment maintains the structural representation of current compensation circuit;
Figure 11 is the structural representation that the utility model embodiment another controllable silicon disclosed maintains current compensation circuit;
Figure 12 is the structural representation that the utility model embodiment another controllable silicon disclosed maintains current compensation circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 4, the utility model provides a kind of controllable silicon and maintains current compensation circuit, this controllable silicon maintains current compensation circuit and is connected with capacitive load, sampling differential circuit 700 and current compensation circuit 800 is also comprised except comprising AC power 600, controllable silicon dimmer 100, rectification circuit 200, described capacitive load comprises DC/DC change-over circuit and/or LED load, in order to clear expression capacitive load, represent with label 340 in specification.Show in Fig. 8 that I0 is on state current, V1 is the output voltage of rectification circuit 200, and the output current of rectification circuit 200 is I1, and load current is I1.
Sampling differential circuit 700, for carrying out sampling to the output signal of described rectification circuit 200 and differential, obtains corresponding differential signal;
Wherein, it should be noted that, when this output signal is current signal, this sample circuit 700 carries out differential process after need sampling to this output current, and geometric meaning current signal being carried out to differential is the rate of change obtaining on state current.
The current compensation circuit 800 be connected with the output of described rectification circuit 200 with described sampling differential circuit 700, for obtaining the load current of described differential signal and described capacitive load 340, and produce offset current according to described differential signal and described load current, make described offset current and described load current sum be greater than silicon controlled and maintain electric current.
Experiment finds, the size maintaining electric current is relevant with the rate of change of on state current, and generally, rate of change is larger, maintains electric current larger.In addition on state current is consistent with the rate of change trend of voltage after rectifier bridge, so after the rate of change of on state current and rectifier bridge the rate of change of voltage all with the positive correlation of maintenance electric current, before not carrying out current compensation, output current=the load current of on state current=rectification circuit, so the utility model using the output current of rectification circuit and load current as the on state current before not compensating, using the output voltage of rectification circuit as the on state voltage before not compensating.
Main thought of the present utility model be when the output current rate of change of rectification circuit 200 or output voltage rate of change larger time, namely maintain electric current larger time produce a larger offset current, when the rate of change of the rate of change of load current or the output voltage of rectification circuit is less, namely maintain electric current less time produce a less offset current, the size of the foundation rate of change of output current or the rate of change dynamic conditioning offset current of output voltage, make load current and offset current sum be greater than maintenance electric current, thus avoid controllable silicon to turn off.
In the specific implementation, sampling differential is carried out by sampling differential circuit 700 pairs of rectification circuit output currents or output voltage, geometric meaning current signal after sampling being carried out to differential is acquisition change rate signal, and the current differential signal after differential process obtained can be used as the rate of change of output current.
Differential signal is sent to current compensation circuit 800, current compensation circuit produces an offset current be directly proportional to differential signal according to differential signal, and namely more large compensation electric current is larger for differential signal, thus the size of dynamic conditioning offset current.
Impulse when the utility model considers controlled silicon conducting relative to prior art and shake the situation of the maintenance curent change caused, and compensate electric current according to the size of impulse and concussion dynamic conditioning offset current, instead of the offset current that fixed compensation one is very large, the utility model will make load current and offset current sum be greater than maintenance electric current, thus avoids controllable silicon to turn off.And the offset current provided is according to impulse and concussion real-time change.So this circuit not only solves the problem that LED is dodged when on state current exists impact and concussion, and improve the service efficiency of compensating circuit.
Due to the rate of change of the output voltage of rectification circuit both can be used in the utility model, the rate of change of output current can be used again, so differential circuit 700 of sampling described in the utility model comprises: voltage sample differential circuit 701 or current sample differential circuit 702;
Wherein voltage sample differential circuit 701, for sampling to the output voltage of described rectification circuit 200, and carries out differential acquisition voltage derivative signal to described output voltage; Current sample differential circuit 702, for sampling to the output current of described rectification circuit 200, and the current differential signal obtained after differential process is carried out to described output current.
Introduce described current compensation circuit 800 below, as shown in Figure 5, comprising:
Comparison circuit, feedback circuit 802 and load current sampling resistor R3; Wherein, described comparison circuit comprises comparator 801.
Described differential signal acts on sampling end, namely the first input end of described comparator 801 is connected with described sampling differential circuit 700 through the 5th resistance R5, for receiving described differential signal, described first input end is connected with described load current sampling resistor R3 through the 4th resistance R4, for receiving the load voltage after load current conversion, second input of described comparator 801 is connected with reference signal, described differential signal through the 5th resistance R5 with the described load current sampling resistor R3 acting in conjunction through described 4th resistance R4 at the first input end of described comparator, described first input end is the sampling end of described comparator, described comparator 801 for described load voltage and described differential signal being compared with value and baseline signal value, and exports comparative result,
An input of described feedback circuit 802 is connected with the output of described comparator 801, the output of described feedback circuit 801 is connected with the first input end of described comparator 801 with described 4th resistance R4 through described load current sampling resistor R3, the output head grounding of described feedback circuit 802.Described feedback circuit 802 exports offset current according to the described comparative result received, and described offset current and described load current be converted to described load voltage with value, inputs to the first input end of described comparator 801,
Equally, described differential signal also can act on reference edge, makes the reference signal+differential signal of new reference signal=setting, then haggles over load current differential signal.When load current differential signal is less than new reference signal, then more compensate.Specifically as shown in Figure 6:
This current compensation circuit 800 comprises: comparison circuit, feedback circuit 802 and load current sampling resistor R3, and described comparison circuit comprises comparator 801;
The first input end of described comparator 801 is connected with described sampling differentiation element through the 6th resistance R6, for receiving described differential signal, described differential signal acts on reference edge, namely described differential signal is through the 6th resistance R6 and the described reference signal acting in conjunction first input end at described comparator 801, and described first input end is the reference edge of described comparator 801; Described comparator 801 second input is connected with one end of described load current sampling resistor R3, for receiving the load voltage after the conversion of described load current, described comparator 801 is for comparing described differential signal and described reference signal with value and described load voltage, and export comparative result, the other end ground connection of described load current sampling resistor R3;
An input of described feedback circuit 802 is connected with the output of comparison circuit, namely be connected with the output of described comparator 801, described feedback circuit 802 output is connected with the first input end of described comparator 801, and another input of described feedback circuit 802 is connected with the input of capacitive load.Described feedback circuit 802, for receiving described comparative result, exports offset current according to comparative result, and described offset current and described load current be converted to described load voltage with value, inputs to the first input end of comparator 801.
To sum up, in order to realize the function compared, needing to use comparison circuit, utilizing load current sampling resistor that load current is converted to load voltage, by sampled voltage and load voltage with an input of value comparing unit.In order to another input of comparing unit is connected with reference signal by the function realizing voltage compare, by reference signal as the reference voltage.
Feedback circuit comprises metal-oxide-semiconductor, when load voltage and differential voltage be less than reference voltage with value time, comparison circuit exports a voltage, this voltage can make metal-oxide-semiconductor be operated in linear zone, according to described and value and reference voltage difference dynamic adjustments mos linear resistance, change offset current, load current is compensated, sue for peace by load current and offset current, obtain the load current after compensating.
Then the load current after compensating and now differential voltage are inputed to the first input end of comparator 801 with value by feedback circuit 802 again, contrast with reference voltage, if the input voltage of first input end is still less than reference voltage, continue to compensate load current, if the input voltage of first input end is greater than reference voltage, stop compensating load current.
The utility model also will solve the flicker problem of zero crossing, so the utility model also comprises:
The current compensation circuit be connected with described capacitive load 340, for receiving described load current, when described load current is less than the maintenance electric current of controllable silicon dimmer, compensate described load current, what make described load current and described offset current is greater than the maintenance electric current of controllable silicon dimmer with value.
Current compensation circuit, act as the part of t2 ~ T as shown in Figure 3, compensates load current, turns off for avoiding controllable silicon.
The circuit structure diagram that lower mask body introduction is concrete, as shown in Figure 7, described voltage sample differential circuit 701 comprises:
The the first electric capacity C1 be connected with described rectification circuit 200 output;
The the first resistance R1 be connected with described first electric capacity C1, the other end ground connection of described first resistance R1;
The second electric capacity C2 in parallel with described first resistance R1;
Described first electric capacity C1 is connected with described current compensation circuit 800 with the points of common connection of described first resistance R1.See Fig. 8: when after rectifier bridge, output voltage exists overshoot, output current I0 also there will be overshoot, through the process of over-sampling differential circuit, can obtain differential signal shown in Fig. 8.
As shown in Figure 9, described current sample differential circuit 702 comprises:
One end is connected with described capacitive load 340, the sampling resistor Rs of other end ground connection;
The first electric capacity C1 that the one end connecing described capacitive load 304 with described sampling resistor Rs is connected, described first electric capacity C1 other end ground connection; Namely described sampling resistor Rs is in parallel with described first electric capacity C1;
Described first electric capacity C1 is connected with described current compensation circuit 800 with the points of common connection of described sampling resistor Rs.
Preferably, as shown in Figure 10 or Figure 11, voltage sample differential circuit 701 and current sample differential circuit 702 also comprise:
NPN type triode Q and filter capacitor C3;
Described first electric capacity C1 is connected with the base stage of described triode Q with the points of common connection of described first resistance R1;
The collector electrode of described triode is connected with positive source VCC;
The emitter of described triode is connected to the ground by emitter resistance R2;
Described filter capacitor C3 is in parallel with described emitter resistance R2.
Preferably, shown in Figure 10, can also connect between rectification circuit 200 output with the first electric capacity C1 a diode (not marking in figure), the anode of this diode connects the output of described rectification circuit 200, and negative electrode connects described first electric capacity C1.
Described in Figure 11, diode is at string between Rs and C1, and the anode of this diode connects Rs, and negative electrode connects C1.
Preferably, as shown in figure 12, described current compensation circuit 800 comprises:
Comparison circuit, feedback circuit and load current sampling resistor R3, described comparison circuit comprises comparator M, the 4th resistance R4 and the 5th resistance R5, and described feedback circuit comprises N-type metal-oxide-semiconductor;
The in-phase input end "+" of described comparator M is connected with load current sampling resistor R3 through the 4th resistance R4, in-phase input end "+" is connected with sampling differential circuit 700 through the 5th resistance R5, inverting input "-" reference signal Vref is connected, and the output of described comparator M is connected with the grid G of described N-type metal-oxide-semiconductor;
The drain D of described N-type metal-oxide-semiconductor is connected with the output of described rectification circuit 200, the source S of described N-type metal-oxide-semiconductor is connected with one end of described load current sampling resistor R3 ground connection, described load current sampling resistor R3 one end ground connection, one end is connected with described 4th resistance R4.
In summary, the utility model provides a kind of controllable silicon and maintains current compensation circuit, and the rate of change of on state current determines the size maintaining electric current to a certain extent, in addition on state current and
the output of rectification circuit voltageamplitude variation tendency consistent, so the rate of change of the rate of change of on state current and the output voltage of rectification circuit all with maintain electric current positive correlation.The utility model obtains differential signal by carrying out sampling differential to the output voltage of on state current or rectification circuit, and the geometric meaning carrying out differential to signal is the rate of change of the rate of change of on state current or the output voltage of rectification circuit.
When the rate of change of the rate of change of on state current or the output voltage of rectification circuit is larger, namely electric current is maintained when differential signal is larger also larger, now just produce a corresponding large offset current according to differential signal, when the rate of change of the rate of change of on state current or the output voltage of rectification circuit is less, namely electric current is maintained when differential signal is less also less, compensate a corresponding little offset current at this moment, load current and offset current sum to be made in a word to be greater than maintenance electric current, thus to avoid controllable silicon to turn off.
Impulse when the utility model considers controlled silicon conducting relative to prior art and shake the situation of the maintenance curent change caused, and according to impulse and the size of shaking dynamic conditioning offset current, instead of the offset current that compensation one is larger, so this circuit solves the problem that LED is dodged when on state current exists and impacts and shake, and improve the service efficiency of compensating circuit.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiment, between each embodiment same or similar part mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (11)
1. controllable silicon maintains a current compensation circuit, and comprise AC power, controllable silicon dimmer, the rectification circuit be connected with capacitive load, is characterized in that, also comprises:
Sampling is carried out and differential to the output voltage of described rectification circuit or electric current, and the differential signal obtained is exported to the sampling differential circuit of current compensation circuit;
Be connected with sampling differential circuit, according to the described current compensation circuit of described differential signal with the electric current and a reference signal generation offset current that flow through described capacitive load.
2. circuit as claimed in claim 1, it is characterized in that, described sampling differential circuit comprises:
The output voltage of described rectification circuit is sampled, and the voltage sample differential circuit that differential obtains voltage derivative signal is carried out to described output voltage; Or,
The output current of described rectification circuit is sampled, and the current sample differential circuit that differential obtains current differential signal is carried out to described output current.
3. circuit as claimed in claim 1, it is characterized in that, described current compensation circuit comprises:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit comprises comparator;
The first input end of described comparator to be connected with described sampling differential circuit through the 5th resistance and to receive described differential signal, described first input end through the 4th resistance to be connected with described load current sampling resistor receive load current change after load voltage, second input of described comparator is connected with described reference signal, described differential signal through the 5th resistance with the described load current sampling resistor acting in conjunction through described 4th resistance at the first input end of described comparison circuit, described first input end is the sampling end of described comparison circuit; Described comparator compares described load voltage and described differential signal with value and described reference signal, and exports comparative result;
An input of described feedback circuit is connected with the output of described comparator, the output of described feedback circuit is connected with the first input end of described comparator with described 4th resistance through described load current sampling resistor, the output head grounding of described feedback circuit, another input of described feedback circuit is connected with the input of capacitive load, described feedback circuit exports offset current according to the described comparative result received, and described offset current and described load current be converted to described load voltage with value, input to the first input end of described comparator.
4. circuit as claimed in claim 1, it is characterized in that, described current compensation circuit comprises:
Comparison circuit, feedback circuit and load current sampling resistor, described comparison circuit comprises comparator;
The first input end of described comparator to be connected with described sampling differential circuit through the 6th resistance and to receive described differential signal, described differential signal is through the 6th resistance and the described reference signal acting in conjunction first input end at described comparator, and described first input end is the reference edge of described comparator; Described comparator second input is connected with one end of described load current sampling resistor, for receiving the load voltage after the conversion of described load current, described comparator compares described differential signal and reference signal with value and described load voltage, and export comparative result, the other end ground connection of described load current sampling resistor;
An input of described feedback circuit is connected with the output of described comparator, and described feedback circuit output is connected with the first input end of described comparator, and another input of described feedback circuit is connected with the input of capacitive load; Described feedback circuit exports offset current according to the described comparative result received, and described offset current and described load current be converted to described load voltage with value, inputs to the second input of comparator.
5. circuit as claimed in claim 2, it is characterized in that, described voltage sample differential circuit comprises:
The first electric capacity be connected with described rectification circuit output end;
The first resistance be connected with described first electric capacity, with the second electric capacity of described first resistor coupled in parallel, the other end ground connection of described first resistance;
Described first electric capacity is connected with described current compensation circuit with the points of common connection of described first resistance.
6. circuit as claimed in claim 2, it is characterized in that, described current sample differential circuit comprises:
Be series at and described capacitive load between sampling resistor;
First electric capacity in parallel with described sampling resistor;
Described first electric capacity is connected with described current compensation circuit with the points of common connection of described sampling resistor.
7. the circuit as described in claim 5 or 6, is characterized in that, also comprises:
NPN type triode and filter capacitor;
Described first electric capacity is connected with the base stage of described triode with the points of common connection of described first resistance;
The collector electrode of described triode is connected with positive source;
The emitter of described triode is connected to the ground by emitter resistance;
Described filter capacitor is in parallel with described emitter resistance.
8. the circuit according to claim 5 or 6, is characterized in that, also comprises:
Diode, described Diode series is between rectification bridge output end and described first electric capacity; The anode of described diode connects rectification bridge output end, and negative electrode connects the first electric capacity; Or,
Described Diode series is between described sampling resistor and described first electric capacity; The anode of described diode connects described sampling resistor, and negative electrode connects the first electric capacity.
9. the circuit as described in claim 3 or 4, is characterized in that, described feedback circuit comprises N-type metal-oxide-semiconductor;
The grid of described N-type metal-oxide-semiconductor is connected with the output of described comparator;
The drain electrode of described N-type metal-oxide-semiconductor is connected with described capacitive load input;
When described comparator is used for the comparing with value and described reference signal of described load voltage and described differential signal, the source electrode of described N-type metal-oxide-semiconductor is connected with one end of described load current sampling resistor ground connection;
When described comparator is used for the comparing with value and described load voltage of described differential signal and described reference signal, one end that source electrode and the described load current sampling resistor of described N-type metal-oxide-semiconductor connect described comparator second input is connected.
10. circuit as claimed in claim 1, it is characterized in that, described capacitive load comprises: LED driver, the filter capacitor in parallel with described LED driver input, the LED light source in parallel with described LED driver output.
11. circuit according to claim 3 or 4, it is characterized in that, described current compensation circuit comprises an integrated circuit and load current sampling resistor;
Described integrated circuit comprises described comparison circuit and described feedback circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420541550.XU CN204190978U (en) | 2014-09-19 | 2014-09-19 | A kind of controllable silicon maintains current compensation circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420541550.XU CN204190978U (en) | 2014-09-19 | 2014-09-19 | A kind of controllable silicon maintains current compensation circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017005219A1 (en) * | 2015-07-08 | 2017-01-12 | Zhejiang Shenghui Lighting Co., Ltd. | Silicon controlled rectifier voltage-protection circuit and method thereof, dimming circuit, and lighting apparatus |
| WO2017219194A1 (en) * | 2016-06-20 | 2017-12-28 | 张升泽 | Electronic chip signal drawing method and system |
| WO2018000173A1 (en) * | 2016-06-28 | 2018-01-04 | 张升泽 | Method and system for preprocessing current of electronic chip |
| WO2018000172A1 (en) * | 2016-06-28 | 2018-01-04 | 张升泽 | Method and system for preprocessing voltage of electronic chip |
| CN108430139A (en) * | 2018-05-28 | 2018-08-21 | 矽力杰半导体技术(杭州)有限公司 | LED drive circuit with controllable silicon dimmer and its control method |
-
2014
- 2014-09-19 CN CN201420541550.XU patent/CN204190978U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017005219A1 (en) * | 2015-07-08 | 2017-01-12 | Zhejiang Shenghui Lighting Co., Ltd. | Silicon controlled rectifier voltage-protection circuit and method thereof, dimming circuit, and lighting apparatus |
| WO2017219194A1 (en) * | 2016-06-20 | 2017-12-28 | 张升泽 | Electronic chip signal drawing method and system |
| WO2018000173A1 (en) * | 2016-06-28 | 2018-01-04 | 张升泽 | Method and system for preprocessing current of electronic chip |
| WO2018000172A1 (en) * | 2016-06-28 | 2018-01-04 | 张升泽 | Method and system for preprocessing voltage of electronic chip |
| CN108430139A (en) * | 2018-05-28 | 2018-08-21 | 矽力杰半导体技术(杭州)有限公司 | LED drive circuit with controllable silicon dimmer and its control method |
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